The MB Sturgis 100575-30PKG is a Type 1 Inverted Flare Pigtail with a 30" length. It is made to hook up a your propane cylinder to a regulator. The Type 1 reduces the risk of the gas supply shutting down because of its greater flow rate. This keeps the system from going into bypass mode. The internal back check prevents back flow gas leaks in the system and it can also shut off the gas under conditions of extreme heat, due to the heat-sensitive shut off. Intended for use with LP Gas.